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Power dependent memory access

一种存储器访问、存储器的技术，应用在静态存储器、数字存储器信息、信息存储等方向，能够解决减小访问速度、编程时间长等问题

Active Publication Date: 2009-08-26
INFINEON TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, reducing the access speed has the undesired result of longer programming times

Method used

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  • Power dependent memory access
  • Power dependent memory access
  • Power dependent memory access

Examples

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Embodiment Construction

[0013] The present invention aims to propose a device and a method for dynamically adjusting the number of memory bits to be accessed in parallel based on the available field strength. This is especially important during write / erase accesses to non-volatile memory (NVM).

[0014] figure 1 is a block diagram showing device 100 accessing memory as a function of available power. The device 100 may be, for example, a contact IC card or device, a contactless IC card or device, a solar device, or any other device with an unstable power environment.

[0015] Device 100 includes measurement circuitry 110 , access control circuitry 120 , memory 130 , read / write circuitry 140 , and data buffer 150 . The measurement circuit 110 determines the available power of the device 100 . In the case of a contactless IC, this power is an RF field, and in the case of a solar powered device, this power is solar power. The access control circuit 120 uses the determined available power to dynamical...

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Abstract

An apparatus and method of accessing a memory by determining available power, and accessing a number of bits of the memory in parallel, wherein the number of bits accessed in parallel is based at least in part on the available power.

Description

technical field [0001] The present invention relates generally to memory access, and more particularly to power-based memory access. Background technique [0002] Contactless integrated circuit (IC) cards, also known as chip cards or smart cards, operate with a read and / or write interrogation device (commonly called a card reader) based on radio frequency (RF) or electromagnetic field communication. [0003] In contactless IC card applications, the card reader usually transmits an RF carrier with a carrier frequency of 13.56MHz. On the one hand, the transmitted carrier wave is used to establish the communication between the card and the card reader according to the existing communication protocol, and on the other hand, it is used to stimulate the contactless card, which obtains the energy required for work through induction. [0004] It is required to have the minimum emission field strength to stimulate the contactless IC card to work. The minimum emission field strength...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/00
CPCG11C5/142G11C7/1006G11C7/1045G11C7/22
Inventor 托马斯·洛伊特格布约瑟夫·海德斯特凡·吕平
Owner INFINEON TECH AG